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[Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pa
From: |
Mike Miller |
Subject: |
[Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pass filter with higher order has strange pass band |
Date: |
Mon, 7 May 2018 14:53:24 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0 |
Update of bug #53855 (project octave):
Item Group: Incorrect Result => Inaccurate Result
Status: None => Confirmed
Release: 4.4.0 => dev
Summary: [signal] butter filter with strange results =>
[octave forge] (signal) butter band pass filter with higher order has strange
pass band
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Follow-up Comment #1:
Confirmed here. It would be useful to compare the filter coefficients to other
software (e.g. SciPy).
Here is a simpler example, since I'm not sure where the 'noise' and
'normalize' functions are coming from, and they aren't needed.
n = 5;
[b, a] = butter (n, [100/22050, 1000/22050]);
freqz (b, a, 4096, 44100);
ax = findall (gcf, 'type', 'axes');
set (ax, 'xlim', [20 4000]);
set (ax, 'xscale', 'log');
subplot (2, 1, 1);
set (gca, 'ylim', [-35 3]);
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?53855>
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- [Octave-bug-tracker] [bug #53855] [signal] butter filter with strange results, Renato, 2018/05/07
- [Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pass filter with higher order has strange pass band,
Mike Miller <=
- [Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pass filter with higher order has strange pass band, Renato, 2018/05/08
- [Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pass filter with higher order has strange pass band, Dmitri A. Sergatskov, 2018/05/08
- [Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pass filter with higher order has round-off errors, Mike Miller, 2018/05/08
- [Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pass filter with higher order has round-off errors, Renato, 2018/05/08
- [Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pass filter with higher order has round-off errors, Mike Miller, 2018/05/08
- [Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pass filter with higher order has round-off errors, Renato, 2018/05/08
- [Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pass filter with higher order has round-off errors, Mike Miller, 2018/05/08